Slider



Patented Mar. 19, 1940 I Q UNITED STATES PATENT OFFICE SIJDEB Louis B. Morin, Bronx, N. Y., assignor to Whitehall Patents Corporation, Bronx, N. Y., a corporation of New York Application July 16, 1938, Serial No. 219,536

- 2 Claims. (Cl. 24-205) This invention relates to separable fasteners be applicable to fasteners, or the sliders of fasand other members or elements and particularly teners, of any type, kind and construction, it is as an example to the production of sliders for herein illustrated as applicable to thermoplastic separable fasteners, and further to a novel methsliders composed of such materials as cellulose 5 od of constructing devices of this kind having acetate which may be readily die cast and then 5 means engaging end stops for retaining the slidreformed in accordance with the method hereer against movement longitudinally of the stringin disclosed to produce what I term an underers when a pull is applied to the stringer ends cut in establishing a. locking or latching engagetending to separate the same. More particularly ment of the slider with the pins l3, I312. The

the invention relates to devices, members or eleslider consists of top and bottom walls I5, I6 10 ments of the general type described which are joined by a connecting web I! at the wide end constructed from thermoplastic material and I8 of the slider, forming at said end diverging which are formed in accordance with the method channels it which converge into a single channel more fully hereinafter described and claimed. at the narrow end 20 of the slider. The side The novel features of the invention will be best edges of. the top and bottom walls include in- 15 understood from the following description and turned flanges 2i as in the general construction annexed drawing in which certain embodiments of devices of this kind. It is also preferred that of the invention are disclosed, the separate parts the top wall l5 be provided on the outer surface being designated by suitable reference 'charthereof with some means, such for example a acters in each of the views, and in which: strap 22 for supporting the usual finger piece or 20 Fig. l is a bottom plan and sectional view of one D1111, not w in Connection therewithform of slider made according to the invention For purposes of simplification, the slider in the indicatingits arrangement upon a portion of following drawing is Shown as a Plain p fastener stringers. what might be termed non-locking type of slider;

25 Fig. 2 is a sectional View through dies or formthat is to say a slider which is not provided with 25 ing parts employed in producing an undercut or means retaining the same against movement in offset recess in a groove formed in one wall of different positions longitudinally of the stringers.

the slider. I It will be understood, however, that the invention Fig. 3 is a plan and sectional view substantially is applicable to sliders of any type and kind. on the line 3-3 of Fig. 2. I The present invention deals primarily with the 30 Fig. 4 is a view similar to Fig. 2 showing parts provision of means for retaining the slider in a different position. against accidental displacement when at the lim- Fig. 5 is a plan and sectional view showing a it, or substantial limit, of its fully closed posislider as produced prior to the forming operation, so that if the stringer tapes are subjected tions herein specifically described, and to stress or strain in the direction of the arrows :r, 35

Figs. 6, 7 and 8 are sectional views of parts of Fig. 1, tending to open the stringers, the slider sliders showing modified forms of grooves which M will be retained automaticallyagainst openmay be employed. ing movement, thus providing what might be The device forming the subject matter of this termed an automatic lock. In accomplishing this application constitutes an improvement on that result it is also desirable to provide a means of 40 disclosed in application, Serial No. 155,864 filed retaining the slider in this position which will,

July 27, 1937 and is made in accordance with a nevertheless, permit the automatic opening method different from that employed in the movement of the slider through the medium of formation of the device in said earlier applicathe usual pull, as will be apparent.

5 tion. In producing a slider of the type and kind il- In Fig. l of the drawing one end portion of two I lustrated in Figs. 1 to 5 inclusive, the slider is stringers l0, Illa, is shown with the interengaging first formed in any desired manner, the slider in coupling links or scoops ll, Ha, arranged on ad the structure being formed by die casting. This jacent beaded edges thereof, .and the ends of. the slider as formed will be provided on the inner stringers beyond the end links are provided with surface of. preferably the bottom wall IE, or in 50 end stops l2, lZa, each provided with downfactcould be applied at the inner surface of both wardly, or downwardly and upwardly directed walls in accordance with the teachings in the pins l3, l3a .for latching engagement with a earlier application herein identified, with grooves slider M, as later described. 23 opening through the large or wide end ill of I! While the present invention is understood to the slider and exposed to each channel l9 therein. These grooves extend longitudinally of the slider in a plane substantially parallel to the longitudinal center of the slider. The grooves preferably have a flared opening, as indicated at 24, so as to permit free insertion of the pins l3, l3a.

After producing a slider in the manner-illustrated in Fig. 5, the next step in the process of forming the desired contour of the grooves to adapt them for the desired function, is to form what I term an undercut or offset in at least one side wall of the grooves, preferably adjacent the inner end thereof, for example, the offset 25 indicated in Figs. 1 and 3 of the drawing. These offsets extend outwardly and are substantially V-shaped or triangular in form to provide an angular wall 25a which is disposed in a position substantially transversely of the path of movement of the stringers with respect to the channels H3 or at approximately 45 to the longitudinal center line of the slider, so that the pins I3. I 3a when moved into the inner ends of the grooves, engage the angular surfaces 25a of the undercuts. thus retaining the slider against opening movement if a stress or strain is applied to the stringers in the direction of the arrow as as previously stated.

In forming the undercut 25 in the workpiece, as shown in Fig. 5 of the drawing, said workpiece is first placed upon an anvil 26 which is shaped to fit within the channels I9 of the slider in the manner illustrated in Fig. 3 of the drawing. The anvil has raised lugs or forming elements 21 of the contour of the resulting undercut grooves to be formed; that is to say. are provided with ofiset parts 210 which form the undercuts 25. The anvil 26 is supported on a' suitable block or bedplate 28 and the forked ends of the anvil, which are arranged within the slider M. are so formed as to engage the inner surface of the outer wall I 5, as indicated in Fig, 2 of the drawing in order to support the workpiece in proper alinement upon the anvil. After this, a punch or die 29 having a recess 30 in the undersurface thereof corresponding to the peripheral contour of the wall I6. is moved into engagement with the slider or the outer surface of the wall Hi to force said wall downwardly in the direction of the anvil. In this operation the projections 21a on the lugs 21 will force the adjacent material of the wall l6 outwardly, which material will enter grooves 3! formed in the surface of the punch or the recess 3|] therein. The result of this operation is illustrated in Fig. 4 of the drawing. It will be understood that the punch or die 29 is then raised and the workpiece removed from the anvil by first moving the same upwardly to disengage the lugs from the resulting undercut grooves formed in the workpiece, which are of the contour illustrated in Fig. l of the drawing.

When removed, the slider or resulting workpiece may now be trimmed and otherwise finished to remove the protruding portions l6a disposed on the outer surface of the wall l6 of the slider, especially if a neat and finished slider is desired. In some instances, however, these projecting portions need not be removed, as they will in no way interfere with the successful operation of the slider. The above operation of forming the undercuts or offset portions in the grooves of the slider when constructing the latter'from thermoplastic materials, will be performed when the material is in a warm or heated condition, that is to say heated sufliciently to render the material thereof workable, and not when this material has become fully chilled or set. In other especially true in dealing with various kinds and classes of thermoplastic devices.

In Fig. 6 of the drawinganother form of undercut is illustrated, and while only one-half of the slider is shown, it will be understood that both sides of the slider may be of the same construction. In this figure, the normal grooves formed in the slider are illustrated at 23a, and the undercut instead of being abrupt and located definitely at the inner end of the grooves, extends longitudinally of one wall of the grooves in a slider, tapered, as is indicated at 32. This type of undercut will have an effective looking or latching surface of greater length longitudinally of the slider than with the structure shown in Figs. 1 and 3. 0n the other hand, the reduced angularity of the engaged wall will provide a freer detachment of the slider in the positive manual movement thereof longitudinally of the stringers from the closed to open positions.

In Fig. 7 of the drawing I have shown a slider which is provided with a double undercut, that is to say in addition to the undercut 32, the opposed wall of the initial grooves 23b is provided with an inner undercut 33. The latter provides a greater freedom of action of the pins !3, 13a and will produce what might be termed a lull dove-tailed groove, whereas the structures in Figs. 1 to 6 inclusive, might be said to be semi dove-tailed grooves.

In Fig. 8 another form of construction is shown wherein the normal grooves 23c have an undercut 34 at the inner ends thereof which is semi-circular in form. The circular formation of the undercut 34 is sufficiently large to freely receive the pins I3, I3a, but are not of such contour as to form a definite lock which would prevent manual movement of the slider into open position, but would effectively produce a latching or locking wall 34a.

This construction is substantially the same as the undercut disclosed in the application herein identified, but is formed without the necessity of drilling the holes through the wall of the slider as is taught in said earlier application. Furthermore with a structure of the type and kind herein disclosed, made in accordance with the method herein defined, it will be apparent that by the proper formation of the die lugs on the anvil. any desired degree of angularity and/or contour can be formed on the undercut, while at the same time the contour of the grooves as a whole. or at least the boundary walls thereof, may be changed. In fact it would also be possible, within the limits of movement of the anvil transversely with respect to the walls of the slider, to form other irregular contours in the bottom wall of the grooves, if desired.

At this time it is well to call atention to the fact that while it is preferred to preform a part of the desired grooves in the workpiece in accordance with the casting operations thereof in the manner which is permitted without complicating the dies employed in forming such die castings, it is also possible to form the workpiece with a plain or ungrooved surface. and to form the ena,1'as,as4 v 3 tire grooves therein by means of the die-member or element on the anvil which forms one part of what may be termed two die members. Another objection to the latter procedure is in extending a large amount of material of the casting to the' outer surface of the wall, in which the groove or grooves are formed, and the added 'work which would be required in removing these protruding bodies if removal is desired.

To more broadly express the invention herein disclosed, apart fromthe present disclosure which is illustrative of one method or mode of carry-' ing the invention into effect, it may be said that the invention consists in first preforming a body or element by die casting the same, especially as. I applied to a die cast thermoplastic body or element, and then subjecting such body or element to what may be termed a die forming operation, wherein a part of the material of said body or element is ,displaced from one wall or surface and extended through another or opposed wall,

forming operations...

In forming grooves on theinner surfaces of both the top andrbottom walls inthe manner heretofore indicated and as specifically disclosed in the application herein cited, it will be understood that the workpiece is simply reversed upon the .anvil and the operation performed in accordance with the teachings illustrated in Figs. 2

and 4'01 the drawing, it .being understood that the recess 30 of the die or tool 29 will be characterized or shaped to receive the strap element 22 on the outer surface of,the wall I! or any other element orpart which may be arranged thereon, so long asthe latter does not interfere with or register with the grooves 3| employed for receiving the displaced material.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent, is: 5

1. A slider for separable fasteners employing stringers having end stops-with projecting latch pins thereon for engaging the slider to retain the same-against accidental displacement when substantially at the limit of its closed position, said slider comprising a channelled body having spaced top and bottom plates joined by a connecting web, at least one of said plates being provided entirely upon the inner surface thereof and at opposed sides of said web with undercut grooves opening through one end of the body, said grooves receiving the latch pins of said end stops, the undercut portions of said grooves engaging the pins to retain the slider against displacement on the stringers when the stringers are subjected to a force tending to separate the stringers. the undercut portions of said grooves forming the outer .edges thereof with respect to the center line of the slider; and said outer edges at substantially 45 'to the longitudinal center of the slider. 1

2. A slider of the class described comprising spaced wall members jointed at one wide end thereof in a connecting web, said members hav-- ing flanges at opposed sides thereof-forming in conjunction with said web, diverging channels at said' :wide end of the slider, the inner surface of one wall of the slider at thewide end thereof having parallel grooves opening through said wide end of the slider and extending into the channel: thereof, the inner ends of said grooves being extended laterally and outwardly toward the flanged sides of the slider wall, the extended portions of said grooves comprising substantially V shaped offsets, and said slider wall having pro- 4 jections on the outer surface thereof in alinement with said offsets.

' LOUIS H. MORIN. 

